SBC Iron Eagle Block - 9.325 4.125/400

The SBC Iron Eagle Block is a premium bare casting engineered for serious small-block Chevrolet engine builders and performance enthusiasts. This 4.125-inch bore, 400-cubic-inch displacement block serves as the foundation for street, strip, and road-course builds where durability and precision matter. Whether you're restoring a classic muscle car, building a reliable daily driver, or constructing a high-output performance engine, the Iron Eagle Block delivers the structural integrity and dimensional accuracy required for dependable power.

Manufactured to exacting specifications, the SBC Iron Eagle Block features ductile iron construction that withstands aggressive boost pressures, nitrous oxide systems, and sustained high-RPM operation. The 9.325-inch deck height accommodates a wide range of stroker and small-block configurations, offering flexibility for custom piston-and-rod combinations. Cast with generous material thickness in critical load-bearing areas—main webbing, cylinder walls, and bearing bosses—this block resists cracking and maintains bore concentricity across repeated heat cycles. The machining-ready surface ensures proper honing clearances and allows machinists to achieve tight tolerances for rings and piston fit.

Ideal for both naturally aspirated and forced-induction applications, the SBC Iron Eagle Block accommodates standard small-block Chevrolet accessories, intake manifolds, and cylinder head combinations. The 400-cubic-inch displacement strikes a balance between low-end torque and mid-range power delivery, making it suitable for street machines, truck platforms, and vintage race cars. At 212 pounds, this robust casting demands proper engine stand support and careful handling during assembly and installation. Professional machine shops and experienced home builders alike trust the Iron Eagle Block's proven track record for consistent performance across thousands of applications.